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Derivative Instruments - Fair Value of Derivative Instruments Balance Sheet Classification (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative Assets |  |
Gross Asset/Liability Amounts | $ 808 | $ 739
Netting Adjustments | (183) | (308)
Net Recognized Fair Value Assets/Liabilities | 625 | 431
Derivative Liabilities |  |
Gross Asset/Liability Amounts | 633 | 5,689
Netting Adjustments | (183) | (308)
Net Recognized Fair Value Assets/Liabilities | 450 | 5,381
Current assets |  |
Derivative Assets |  |
Gross Asset/Liability Amounts | 562 | 739
Netting Adjustments | (179) | (308)
Net Recognized Fair Value Assets/Liabilities | 383 | 431
Noncurrent assets |  |
Derivative Assets |  |
Gross Asset/Liability Amounts | 246 |
Netting Adjustments | (4) |
Net Recognized Fair Value Assets/Liabilities | 242 |
Current liabilities |  |
Derivative Liabilities |  |
Gross Asset/Liability Amounts | 629 | 5,669
Netting Adjustments | (179) | (308)
Net Recognized Fair Value Assets/Liabilities | 450 | 5,361
Noncurrent Liabilities |  |
Derivative Liabilities |  |
Gross Asset/Liability Amounts | 4 | 20
Netting Adjustments | (4) | 0
Net Recognized Fair Value Assets/Liabilities | $ 0 | $ 20

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